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Lug lug

WeLikeIt

Member
63
31
18
North Carolina
Buick Ownership
2018 Regal TourX, 2003 Century, 1989 Regal
Can anything be done to tell the transmission to hold higher rpms? Obviously I can manually shift it... but I cant convince my wife to do so. Running around town trying to gradually accelerate at 1200rpm... I can hear the lugging. And these are rather slow to down shift when you try to push the pedal down to make it shift. Can anything be done, within the warranty, to adjust the shift points a bit?
 

WeLikeIt

Member
63
31
18
North Carolina
Buick Ownership
2018 Regal TourX, 2003 Century, 1989 Regal
Using a higher gear to lug the engine is how they achieve the fuel economy ratings. The options would be manual shifting or having the transmission re-calibrated in the aftermarket.
In my limited experience, most 4 cylinders actually return better mileage numbers when they can run at or over 2000rpm. I've even experimented with the tourx, and when I manually shift it, I can gain almost 2mpg by using cruise control and holding the rpms over 2k. So... gm goofed.
 

landsharkmz3

Member
58
34
18
In my limited experience, most 4 cylinders actually return better mileage numbers when they can run at or over 2000rpm. I've even experimented with the tourx, and when I manually shift it, I can gain almost 2mpg by using cruise control and holding the rpms over 2k. So... gm goofed.
It would be interesting to see more definitive information on this. I tend to think of it in terms of BSFC (brake specific fuel consumption). If we treat the engine as a naturally aspirated for a second (below the turbo), you want to have the throttle open and reduce pumping losses. One descriptive way of putting it would be to operate the engine hard, but at a weaker point in its torque curve. That generally is the efficient way to do it. The opposite situation illustrates the point, and that example would be driving around at 55mph in 2nd gear. You would burn more fuel than 6th gear.

The LTG spools about 2k. As the turbo spools, it will give improved cylinder filling at partial throttle (help reduce pumping losses). This should somewhat offset the situation described above.
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PrincipalDan

Member
78
74
18
Gallup, NM
Buick Ownership
2018 Regal TourX
I still think the car adapts if driven hard often, to a more sporty shift mode.
As a guy who likes to feel the twin clutch AWD working in certain parts of his morning commute (and having 5000 miles on the car) I'm starting to believe that too. The more I drive aggressively the harder it seems to be to catch the transmission napping.
 

FavaBean

Active member
195
121
43
DE
Buick Ownership
2018 Regal TourX Essence
I agree too.. But OP seems to also be also concerned with mpg and therefore will not drive car hard/long enough (not that there is anything wrong with that) to see a change in tranny response towards downshifting.

Just curious...
@WeLikeIt are you running regular or premium?
@PrincipalDan what are you running?

My TourX has certain mannerisms when running 87.

I know, I know.... I'm not trying to turn this thread into a dreaded octane discussion!!
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PrincipalDan

Member
78
74
18
Gallup, NM
Buick Ownership
2018 Regal TourX
I agree too.. But OP seems to also be also concerned with mpg and therefore will not drive car hard/long enough (not that there is anything wrong with that) to see a change in tranny response towards downshifting.

Just curious...
@WeLikeIt are you running regular or premium?
@PrincipalDan what are you running?

My TourX has certain mannerisms when running 87.

I know, I know.... I'm not trying to turn this thread into a dreaded octane discussion!!
I live in the mountain west at roughly 7000 ft in altitude so the highest octane gas I can get is 91 octane. https://www.sidehustlenation.com/high-altitude-low-octane/

My TourX has 5000 miles on it but roughly 3000 of those were from a family vacation taken right after purchase. On that trip when I could get it I bought 93 octane.
 

BoostedRegal2.0

Well-known member
695
267
63
Buick Ownership
2014 Regal 2.0 Turbo AWD Trifecta Tune
The best thing to do is tune the car. The transmission will shift better AND the motor will make more power. To me it's a win/win situation.
 
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